rounded panes, cwd fix mac

result

@@ -1 +1 @@
-/nix/store/6vj9g5xzxd0whdnxd0zsg02m1rwsrlrn-slerm-0.1.0
+/nix/store/3b7xvjwsg42myksf85lyj1x89269p0sb-slerm-0.1.0

src/app.rs

@@ -6,7 +6,7 @@ use crate::{
     render::color,
 };
 use anyhow::{Result, ensure};
-use egui::{Color32, Rect, Stroke, vec2};
+use egui::{Color32, CornerRadius, Rect, Stroke, vec2};
 use std::{
     collections::{BTreeMap, HashSet},
     path::PathBuf,
@@ -543,6 +543,9 @@ fn grab_keys(ctx: &egui::Context) {
     });
 }
 
+/// Corner rounding shared by a pane's border and its title bar.
+const CORNER: u8 = 5;
+
 fn show_pane(
     ui: &mut egui::Ui,
     id: PaneId,
@@ -553,9 +556,21 @@ fn show_pane(
 ) -> bool {
     let accent = color(config::rgb(&config.accent).unwrap());
     let title_rect = Rect::from_min_size(rect.min, vec2(rect.width(), 25.0_f32.min(rect.height())));
+    // The title bar only rounds off the top of the pane, unless the pane is so
+    // short that the bar is all there is of it.
+    let bottom = if title_rect.height() < rect.height() {
+        0
+    } else {
+        CORNER
+    };
     ui.painter().rect_filled(
         title_rect,
-        0,
+        CornerRadius {
+            nw: CORNER,
+            ne: CORNER,
+            sw: bottom,
+            se: bottom,
+        },
         Color32::from_gray(if active { 43 } else { 31 }),
     );
     ui.painter()
@@ -585,7 +600,7 @@ fn show_pane(
     }
     ui.painter().rect_stroke(
         rect,
-        0,
+        CORNER,
         Stroke::new(
             1.0_f32,
             if active {

src/pane.rs

@@ -46,13 +46,29 @@ fn local_pwd(pwd: &str) -> Option<PathBuf> {
         return pwd.starts_with('/').then(|| PathBuf::from(pwd));
     };
     let (host, path) = rest.split_once('/')?;
+    // A shell may report either the short name or the FQDN, so compare the leading
+    // label of each.
+    let short = |name: &str| name.split('.').next().unwrap_or(name).to_ascii_lowercase();
     let local = host.is_empty()
         || host.eq_ignore_ascii_case("localhost")
-        || std::fs::read_to_string("/proc/sys/kernel/hostname")
-            .is_ok_and(|name| name.trim().eq_ignore_ascii_case(host));
+        || hostname().is_some_and(|name| short(&name) == short(host));
     local.then(|| PathBuf::from(percent_decode(&format!("/{path}"))))
 }
 
+fn hostname() -> Option<String> {
+    unsafe extern "C" {
+        fn gethostname(name: *mut std::ffi::c_char, len: usize) -> std::ffi::c_int;
+    }
+    let mut buf = [0u8; 256];
+    // SAFETY: at most `len` bytes are written, leaving the final byte of `buf` as
+    // the terminator even when the name is truncated.
+    if unsafe { gethostname(buf.as_mut_ptr().cast(), buf.len() - 1) } != 0 {
+        return None;
+    }
+    let end = buf.iter().position(|&b| b == 0)?;
+    String::from_utf8(buf[..end].to_vec()).ok()
+}
+
 fn percent_decode(path: &str) -> String {
     let mut out = Vec::with_capacity(path.len());
     let mut bytes = path.bytes();

src/pty.rs

@@ -111,11 +111,10 @@ impl Pty {
         })
     }
 
-    /// The working directory of the foreground process group, via /proc. Shells
-    /// that emit OSC 7 are reported by the terminal instead; this covers the rest.
+    /// The working directory of the foreground process group. Shells that emit
+    /// OSC 7 are reported by the terminal instead; this covers the rest.
     pub fn cwd(&self) -> Option<PathBuf> {
-        let pid = self.master.process_group_leader()?;
-        std::fs::read_link(format!("/proc/{pid}/cwd")).ok()
+        process_cwd(self.master.process_group_leader()?)
     }
 
     pub fn resize(&self, cols: u16, rows: u16, cw: u32, ch: u32) -> Result<()> {
@@ -129,6 +128,72 @@ impl Pty {
     }
 }
 
+#[cfg(target_os = "linux")]
+fn process_cwd(pid: i32) -> Option<PathBuf> {
+    std::fs::read_link(format!("/proc/{pid}/cwd")).ok()
+}
+
+/// macOS has no /proc, so the current directory comes from `proc_pidinfo`.
+#[cfg(target_os = "macos")]
+fn process_cwd(pid: i32) -> Option<PathBuf> {
+    use std::{ffi::CStr, os::unix::ffi::OsStrExt};
+
+    // <sys/proc_info.h>. `vinfo_stat` is spelled as its 136 bytes of padding
+    // because only the path that follows it is of interest here.
+    #[repr(C)]
+    struct VnodeInfo {
+        stat: [u64; 17],
+        vtype: i32,
+        pad: i32,
+        fsid: [i32; 2],
+    }
+    #[repr(C)]
+    struct VnodeInfoPath {
+        info: VnodeInfo,
+        path: [std::ffi::c_char; 1024],
+    }
+    #[repr(C)]
+    struct VnodePathInfo {
+        cdir: VnodeInfoPath,
+        rdir: VnodeInfoPath,
+    }
+    const PROC_PIDVNODEPATHINFO: i32 = 9;
+
+    unsafe extern "C" {
+        fn proc_pidinfo(
+            pid: i32,
+            flavor: i32,
+            arg: u64,
+            buffer: *mut std::ffi::c_void,
+            buffersize: i32,
+        ) -> i32;
+    }
+
+    let size = size_of::<VnodePathInfo>();
+    // SAFETY: the call writes at most `size` bytes into `info`, and reports how
+    // many it wrote. A short write leaves the path unset, so it is rejected.
+    unsafe {
+        let mut info = std::mem::zeroed::<VnodePathInfo>();
+        let written = proc_pidinfo(
+            pid,
+            PROC_PIDVNODEPATHINFO,
+            0,
+            (&raw mut info).cast(),
+            size as i32,
+        );
+        if written < size as i32 {
+            return None;
+        }
+        let path = CStr::from_ptr(info.cdir.path.as_ptr());
+        (!path.is_empty()).then(|| PathBuf::from(std::ffi::OsStr::from_bytes(path.to_bytes())))
+    }
+}
+
+#[cfg(not(any(target_os = "linux", target_os = "macos")))]
+fn process_cwd(_pid: i32) -> Option<PathBuf> {
+    None
+}
+
 impl Drop for Pty {
     fn drop(&mut self) {
         let _ = self.shutdown.send(());